Vocaloid is a computer music program that synthesizes singing in Japanese. Developed by Crypton Future Media, it utilizes Yamaha's Vocaloid2 technology with specially recorded vocals of voice actors. To create a song, the user must input the melody and lyrics. A piano roll type interface is used to input the melody and the lyrics can be entered on each note. The software can change the stress of the pronunciations, add effects such as vibrato, or change the dynamics and tone of the voice. The series is intended for professional musicians as well as light computer music users. The programmed vocals are designed to sound like an idol singer from the future. According to Crypton, because professional singers refused to provide singing data, in fear that the software might create their singing voice's clones, Crypton changed their focus from imitating certain singers to creating characteristic vocals. This change of focus led to sampling vocals of voice actors. Each vocal is given an anime-type character with specifications on age, height, weight, and musical forte (as in the type of music, range and tempo). A Hatsune Miku manga called Maker Hikoshiki Hatsune Mix was also serialized in the Japanese manga magazine, Comic Rush on November 26, 2007, published by Jive. The manga was drawn by Kei, the original character designer for Hatsune Miku.